diff --git a/applets/digital-clock/package/contents/ui/CalendarView.qml b/applets/digital-clock/package/contents/ui/CalendarView.qml
--- a/applets/digital-clock/package/contents/ui/CalendarView.qml
+++ b/applets/digital-clock/package/contents/ui/CalendarView.qml
@@ -368,5 +368,6 @@
         iconSource: "window-pin"
         checked: plasmoid.configuration.pin
         onCheckedChanged: plasmoid.configuration.pin = checked
+        tooltip: i18n("Keep Open")
     }
 }
diff --git a/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml b/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml
--- a/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml
+++ b/applets/systemtray/package/contents/ui/ExpandedRepresentation.qml
@@ -47,6 +47,7 @@
         onCheckedChanged: plasmoid.configuration.pin = checked
         iconSource: "window-pin"
         z: 2
+        tooltip: i18n("Keep Open")
     }
 
     PlasmaExtras.Heading {